Another fun nuclear weapon that would have destroyed Germany is Blue Peacock. It was a series of nuclear mines placed across West Germany to be detonated if the Soviets invaded. They used chickens to keep the mines warm in cold winters.
One problem with nuclear mines is that they're unattended. If some crazy circumstance happens where the US loses control over the area, but it's not war, then you suddenly have a bunch of hidden nukes lying around that could detonate.
Another problem is that if the Soviets ever found them then they could use them as effective propaganda. If even one of those mines goes off, then they could say that they're liberating the Germans from their American oppressors. After all, you don't nuke your own ally and a nuclear detonation is hard to hide.
That was really the defining philosophy of the Cold War nuclear threat escalation; total extermination of millions of civilians in as short a time as possible.